fierce and strong both have the same connoation, as well as close interchangability. This makes it impossible to say one is the strongest while the other the fiercest. *******************Either both end in est or both end in er. You must choose. So look at my example below.

Bob and Sam may be in the same math class, but Bob is the wisest person and Sam is the smartest.

Bob and Sam may be in the same math class, but Bob is wiser and Sam is smarter.

Which one is correct? The bottom one. Why? The word BUT shows contradictioary. but + and don’t mix with est. keep reading it and it’ll sound stupid.

that probably didn’t help. =\\\\ im a bad teacher. but the key is to read things academically, not with common knowledge. GL HF

In the second sentence, it appears that the watch presses the button, which clearly isn’t the case. In other words, because of the positioning of the phrase, the verb “pressing” seems to have the watch as its subject. Without changing the rest of the sentence, you could use the phrase “when a button is pressed” rather than “when pressing a button”.